Top Deal: Scores of eager Litecoin miners are gobbling up all the available AMD Radeon R9 Series graphics cards in hopes of generating a mountain of virtual currency, but don’t worry, if it’s a high-end graphics card for actual gaming you’re after, there are plenty out there. One is the topic of today’s top deal — an MSI Gaming N780 TF 3GD5/OC GeForce GTX 780 for $490 with free shipping (normally $520; additional $20 mail-in-rebate)